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Re: [Qemu-discuss] libvirt live migration, qcow2 image, nbd server

From: Jakob Bohm
Subject: Re: [Qemu-discuss] libvirt live migration, qcow2 image, nbd server
Date: Fri, 13 Feb 2015 11:27:58 +0100
User-agent: Mozilla/5.0 (Windows NT 6.3; WOW64; rv:31.0) Gecko/20100101 Thunderbird/31.4.0

On 13/02/2015 03:41, Edward Young wrote:

Hi all,

When I live migrate a vm using 

"migrate --live --copy-storage-all mig-vm qemu+ssh:// tcp://"

I got the following error

             WARNING: Image format was not specified for 'nbd://node2:49155/drive-virtio-disk0' and probing guessed raw.

258          Automatically detecting the format is dangerous for raw images, write operations on block 0 will be restricted.

259          Specify the 'raw' format explicitly to remove the restrictions.

From the error itself, I can tell that nbd server treat this image as raw, rather than qcow2. My platform is libvirt+qemu. the image type of this vm is indeed qcow2. I do not know how to let nbd know this image format.



Are you sure it is not saying that the image served by qemu (on the destination) based on *decoding* the qcow2 disk is treated as a raw image, which it probably is, with the serving qemu instance mapping the "raw" read/writes to proper qcow2 operations?

Just guessing of cause.


Jakob Bohm, CIO, Partner, WiseMo A/S.  http://www.wisemo.com
Transformervej 29, 2860 Søborg, Denmark.  Direct +45 31 13 16 10
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